* perf: make `/gsd:set-profile`'s implementation more programmatic
* perf: run the set-profile script without Claude needing to invoke it
- inject the script's output as dynamic context into the set-profile skill, so that Claude doesn't
need to invoke it and can simply read + print the output to the user
- reference: https://code.claude.com/docs/en/skills#inject-dynamic-context
* feat: improve output message for case where model profile wasn't changed
* feat: specify haiku model for set-profile command since it's so simple
* fix: remove ' (default)' from previousProfile to avoid false negative for didChange
* chore: add docstring to MODEL_PROFILES with note about the analogous markdown reference table
* chore: delete set-profile workflow file that's no longer needed
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